diff --git a/doc/rpm-build/apache.conf b/doc/rpm-build/apache.conf
index 0b2112855b..f99056dac5 100644
--- a/doc/rpm-build/apache.conf
+++ b/doc/rpm-build/apache.conf
@@ -9,6 +9,9 @@ Alias /egroupware /usr/share/egroupware
 # Enable ActiveSync protocol support via eSync app
 Alias /Microsoft-Server-ActiveSync /usr/share/egroupware/activesync/index.php
 
+# iOS 4.3+ calendar requires that to autodetect accounts
+RedirectMatch ^(/principals/users/.*)$ /egroupware/groupdav.php$1
+
 <Directory /usr/share/egroupware/>
   Options FollowSymLinks ExecCGI
   AllowOverride None
diff --git a/groupdav.htaccess b/groupdav.htaccess
index cbec4e6e08..b68579703b 100755
--- a/groupdav.htaccess
+++ b/groupdav.htaccess
@@ -40,3 +40,6 @@ RewriteBase /
 RewriteRule ^.well-known/(caldav|carddav)$ /egroupware/groupdav.php/ [R]
 RewriteCond %{REQUEST_METHOD}	^(PROPFIND|OPTIONS)$
 RewriteRule ^/$ /egroupware/groupdav.php/ [R]
+
+# iOS 4.3+ calendar requires that to autodetect accounts
+RewriteRule ^(/principals/users/.*)$ /egroupware/groupdav.php$1 [R]